Oxford Blue (#002147)

/* Background */
.element {
    background-color: #002147;
}

/* Text */
.element {
    color: #002147;
}

/* Border */
.element {
    border: 1px solid #002147;
}

/* Linear gradient to complementary */
.element {
    background: linear-gradient(
        to right,
        #002147,
        #8E4C00
    );
}

/* Radial gradient */
.element {
    background: radial-gradient(
        circle,
        #002147,
        #8E4C00
    );
}

// SCSS variable
$oxford-blue: #002147;

// With RGB channels (useful for rgba() usage)
$oxford-blue-r: 0;
$oxford-blue-g: 33;
$oxford-blue-b: 71;

// Usage
.element {
    background-color: $oxford-blue;
    color: rgba($oxford-blue-r, $oxford-blue-g, $oxford-blue-b, 0.8);
}